Ravens wide receiver Breshad Perriman practices during the second day of training camp at the Under Armour Performance Center.

Ravens wide receiver Breshad Perriman practices during the second day of training camp at the Under Armour Performance Center.

(Kenneth K. Lam / Baltimore Sun)

Coaches and teammates alike have raved about rookie wide receiver Breshad Perriman’s speed on the field and his ability to learn quickly off it.

But as a knee injury suffered late in his first training camp practice Thursday keeps Perriman off the field — he missed Friday, and Saturday’s padded practice with what coach John Harbaugh called a bruise — his progress could be stunted.

Ravens strong safety Matt Elam may have torn his biceps and is undergoing a magnetic resonance imaging exam today to determine the severity of his injury, according to sources.

It's feared that the injury could be season-ending. A complete tear where surgery is required could take four to six months of recovery time whereas a partial tear typically heals in three to six weeks.

Ravens tight end Maxx Williams (87) and Nick Boyle run a drill at the team's first day of training camp, Thursday, July 30, 2015, in Owings Mills.

Ravens tight end Maxx Williams (87) and Nick Boyle run a drill at the team's first day of training camp, Thursday, July 30, 2015, in Owings Mills.

(Patrick Semansky / Associated Press)

Regardless of rookie Maxx Williams being a second-round draft pick, it’s hard to imagine him beating out Crockett Gillmore as the full-time starting tight end.

Williams isn’t a strong enough blocker yet. To be honest, he needs some more butt in his pants and a year in the weight room. During a one-on-one period Saturday where tight ends had to block outside linebackers, Gillmore performed well. It...

Ravens wide receiver Trent Steelman practices on the third day of 2015 training camp at the Under Armour Performance Center.

Ravens wide receiver Trent Steelman practices on the third day of 2015 training camp at the Under Armour Performance Center.

(Kenneth K. Lam / Baltimore Sun)

Trent Steelman traveled an unconventional, twisting path to the Ravens' practice field Saturday after the former Army standout quarterback was signed to a contract years after he first tried out for the AFC North franchise.

Steelman auditioned for the Ravens at a rookie minicamp two years ago and was offered a contract, but couldn't join the team because of his military service commitment.

Ravens offensive coordinator Marc Trestman conducts practice on the third day of 2015 training camp at the Under Armour Performance Center.

Ravens offensive coordinator Marc Trestman conducts practice on the third day of 2015 training camp at the Under Armour Performance Center.

(Kenneth K. Lam / Baltimore Sun)

The true litmus test for new offensive coordinator Marc Trestman and a blended offense that still incorporates many of former offensive coordinator Gary Kubiak's West Coast offensive concepts is roughly six weeks away.

That's when Trestman's offensive wrinkles, including his penchant for deep shots, screen passes to the running backs and plenty of double tight end formations, will be on display when...